Smog blankets scyscrapers in Mexico City on March 17. The city is suffering its worst pollution in more than a decade, and cars are required to stay off the street one day a week.
Rebecca Blackwell/AP
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Paul Zakayo (left) and Nasa Jackson Mairi were nabbed by a team of park rangers at the Mara Conservancy in Kenya and charged with killing three impalas and a gazelle in the wildlife sanctuary.
Greg Warner/NPR
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Stalking Poachers With High-Tech Cameras And Old-Fashioned Smarts

Ian Burkhart prepares for a training session in Columbus, Ohio. To move muscles in Burkhart's hand, the system relies on electrodes implanted in his brain, a computer interface attached to his skull, and electrical stimulators wrapped around his forearm.
Lee Powell/The Washington Post/Getty Images
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